Implements for the displacement of crop lying on the ground

ABSTRACT

A raking implement has at least one, preferably two, rotating rake wheels which are driven via a power takeoff to rotate about upwardly extending axes. Each rake wheel has radially extending arms, the ends of which have tines on supports pivotally connected to the arms. The tines are pivoted to move from one working position to another or a transport position in response to the torque of the driving connection so that one or more working positions can be achieved automatically during operation. The driving connection includes a geared hub connected through a coupling or directly to the tine supports and the tine supports can be movably associated or linked to the radial arms to rotate same after the tines and supports have been pivoted to another position. One or more stops and other adjusting means are employed to arrange and/or limit the positions of the tines and supports relative to the remainder of the rake wheel.

Unite States Van Der Lely [4 1 Oct. 15, 1974 Cornelius Van Der Lely, 7,Bruschenrain, Zug, Switzerland Filed: Nov. 7, 1972 Appl. No.: 304,382

[76] inventor:

Foreign Application Priority Data [56] References Cited UNITED STATESPATENTS 2/1971 Van Der Lely et al 56/370 3,648,448 3/1972 Maugg r.56/370 3,664,106 5/1972 Maugg 56/370 FOREIGN PATENTS OR APPLICATIONS1,221,223 3/1971 Great Britain 56/370 Primary ExaminerAntonio F. GuidaAttorney, Agent, or Firm-Mason, Mason & Albright [5 7] ABSTRACT A rakingimplement has at least one, preferably two, rotating rake wheels whichare driven via a power takeoff to rotate about upwardly extending axes.Each rake wheel has radially extending arms, the ends of which havetines on supports pivotally connected to the arms, The tines are pivotedto move from one working position to another or a transport position inresponse to the torque of the driving connection so that one or moreworking positions can be achieved automatically during operation. Thedriving connection includes a geared hub connected through a coupling ordirectly to the tine supports and the tine supports can be movablyassociated or linked to the radial arms to rotate same after the tinesand supports have been pivoted to another position. One or more stopsand other adjusting means are employed to arrange and/or limit thepositions of the tines and supports relative to the remainder of therake wheel.

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PATENTED am 1 5 m4 sum 12 or IMPLEMENTS FOR THE DISPLACEMENT OF CROPLYING ON THE GROUND One object of the invention is to provide adifferent and improved construction to move the tines into their workingpositions.

According to one aspect of the invention, there is provided an implementof the kind set forth, wherein the tines are coupled with mechanicaldriving mechanism of the rake member and are arranged to be moved fromone position into another by a torque exerted on the rake member at thecommencement of its rotation.

Although the construction embodying the invention may be employed foradjusting the rake tines from one working position into a furtherworking position, it is particularly important that, in accordance withthe invention, the tines are movable from an inoperative transportposition into a working position.

The invention is important for those implements which have a largeworking width, for example, hay making machines having rake members thatare rotatable about upright axes, although the invention may also beapplied to other hay making machines, for example, to drum tedders.

Although the invention may be applied to most rake members whose tinesare displaced outwardly, the structure embodying the invention may beparticularly successfully employed when the tines are arranged on therake member so as to be swung about pivots. These pivots may, ifdesired, be substantially horizontal in the lowermost positions of thetines but, in an advantageous embodiment of the invention, said pivotsare vertically or substantially vertically disposed in said positions.

In order to bring the tines from one position to the other, the rakemember in one embodiment of the invention comprises two elements thatare arranged around its axis of rotation and are coupled with the tines,the torque to start the rotation being exerted on one element so thatthe elements are relatively displaced and the tines are adjusted.

According to a further aspect of the invention the elements are arrangedso as to be turnable relative to each other. An advantageous structuremay be obtained by arranging the tines movably on one of the elementsand by coupling them, in addition, with the other element. This may becarried out in various ways, bur preferably the connection isestablished by means of one or more coupling rods which are hinged tothe ele ments or are otherwise pivotable relative thereto.

It has been found that, according to a further embodiment of theinvention, it is advantageous if the rake member has means with the aidof which the movements of the elements relative to each other arelimited. It appears that in this case the adjustment of the tines underheavy working conditions in practice is best ensured.

It is possible to arrange the coupling rods and the element driven bythe torque above the element to which the tines are movably connected.However, it has been found to be advantageous to arrange the drivenelement and the coupling mechanism beneath the driving element or, withrespect to the crop, at least behind this element so that there is onlylittle risk of the crop getting into the mechanism and jamming it.

The rake member preferably comprises means for limiting the movement ofthe elements relative to each other so that the positions of the tinescan be fixed. Said means may be formed by buffer springs, but at anyrate by one or more stops.

It is often advantageous that the rake member should have not only atransport position and one working position but also a second workingposition. This second working position may be obtained in a simplemanner, when the magnitude of the displacement of the elements relativeto each other can be adjusted. In a further embodiment of the invention,the length of the movement of the elements relative to each other isadjustable so that the position of the tines is variable, therepreferably being provided an adjustable stopfor the adjustment of thevarious working positions of the tines.

In accordance with a further aspect of the invention the inertia forcesare primarily utilised for moving the tines back into their initialpositions. However, as an alternative, the tines may be moved back totheir initial positions by means of springs or by their own weight.

The construction embodying the: invention is particularly important foruse in an implement comprising two or more rake members; however, it mayalso be applied to an implement comprising one rake member.

In accordance with a further aspect of the invention, the means formoving the tines from one position to another may, in addition, be usedfor a periodical displacement of the tines during each revolution. Thisconstruction may be especially important for use in machines comprisingone rake member.

According to a further aspect of the invention, one of the elements isarranged ecce-ntrically around the axis of rotation of the rake memberand, during one revolution, it turns around said axis so that during therevolution the tines are displaced.

It has been found to be advantageous, in accordance with a furtheraspect of the invention, to provide a coupling for each tine, or eachgroup of tines, with the other element. In this case the forces areadvantageously distributed during the displacement of the tines.

For a better understanding of the invention, and to show how the samemay be carried into effect, reference will now be made, by way ofexample, to the accompanying drawings, in which:

FIG. 1 is a schematic plan view of an implement comprising two rakemembers embodying the invention, in a working position,

FIG. 2 shows the same implement in an inoperative transport position,

FIG. 3 is an enlarged plan view of a rake member,

FIG. 4 is a section taken on the line IV-IV in FIG.

FIG. 5 is a plan view of the rake tines of the rake member of FIG. 3 intwo operational positions,

FIG. 6 is a plan view of a different construction of a rake member, inwhich the tines are coupled with each other,

FIG. 7 is a plan view of a third embodiment of a rake member, in which atine moving mechanism is arranged beneath tine-supporting arms,

FIG. 8 is a section taken on the line VIII-VIII in FIG. 7,

FIG. 9 is a plan view of an implement embodying the invention comprisingone rake member,

FIG. is a plan view of a rake member comprising a spring for returningthe tines to an inoperative transport position,

FIG. 11 is a plan view of a rake member in which the tines are shiftedoutwardly into their working positions,

FIG. 12 is a section taken on the line XII-XII in FIG. 1 1,

FIG. 13 is a plan view of a rake member in which the tine movingmechanism comprises a slot and a coupling pm,

FIG. 14 is a perspective view of the mounting of a swath board suitablefor use in the implement shown in FIGS. 1 and 2,

FIG. 15 shows two swath boards in an inoperative transport position, toa reduced scale,

FIG. 16 is an enlarged partial cross-sectional view corresponding withthe cross-sectional view of FIG. 4,

FIG. 17 is a plan view of part of a further embodiment of one of therake members of the implement,

FIG. 18 is a vertical section substantially corresponding to FIG. 17 butalso showing further parts of the implements,

FIG. 19 is a plan view showing further details of parts that can be seenin FIG. 17,

FIG. 20 is an enlarged sectional view showing further details of partsthat can be seen in FIG. 18,

FIG. 21 substantially corresponds to FIG. 17 but shows an alternativerake member construction, and

FIG. 22 is an enlarged sectional elevation showing further details ofthe construction and arrangement of certain parts that can be seen inFIG. 21

The implement shown in FIGS. 1 and 2 comprises two rake members 1, whichare adapted to rotate about upright vertically or substantiallyvertically extending axes afforded by shafts 2, in a direction asindication by the arrows A in FIG. 1. The rake members are connected toa frame beam 3, extending in the working position (FIG. 1)perpendicularly transverse to the direction of movement B; said beamaccommodates a driving gear for the rake members in a manner to bedescribed in detail hereinafter. Above each rake member a gear box 4 isprovided, by means of which the associated rake member is driven. Gearsin the gear boxes 4 are coupled to each other by means of a shaft 31arranged in the frame beam 3 so that the driving force from one gear boxcan be transmitted to the other. One of the gear boxes comprises aninput shaft (not shown in these Figures), which can be coupled with theaid of universal joints and an auxiliary shaft 5 with the power take-offshaft of a tractor 6, so that the rake members can be driven by means ofthe power take-off shaft of the tractor. The implement is supported in aknown manner by ground wheels (not shown) arranged beneath the rakemembers.

The frame beam 3 is provided with a drawbar 7, which is coupled with thetractor so as to be freely pivotable. The drawbar 7 is adapted to pivotaround a vertical shaft 8 relative to the frame beam 3 and, in knownmanner, it can be turned into either of two different positions relativeto the frame beam 3. The implement may be provided at the rear withswath boards 9, which may be employed when the implement has to formswaths.

If the implement has to be used for spreading hay, these swath boardscan be tilted upwardly as will be described in detail hereinafter. Therake members 1 are provided with tines 10, which project outwardly whenthe implement is in operation.

In operation, the implement has a very large working width, which isindicated in FIG. 1 by the reference C. The implement may be moved intothe transport position shown schematically in FIG. 2. In this transportposition the tines 10 are turned inwardly while, with respect to theframe beam 3, the drawbar 7 extends obliquely to the rear in thedirection of movement B, it being advantageous for this purpose that thedrawbar 7 should be located near one end of the frame beam 3.

In the new position, the drawbar 7 is locked in position relative to theframe beam 3 by a conventional locking member (not described in detail).Moreover, the swath boards 9 are tilted upwardly so that they arelocated on top of the implement. In this case the implement has atransport width D, which is materially smaller than the effective widthC. The width D is less than 65 percent of the width C. The working widthC is such that the implement can encompass three conventionally spacedmowing swaths so that said three mowing swaths can be spreadsimultaneously. The distance C may be about 360 centimeters or evenmore.

One of the ground wheels arranged beneath the rake members and not shownherein may be a castor wheel,

which comprises nevertheless a locking member so that it can be lockedagainst a castoring movement in a position in which its axis of rotationextends parallel to the frame beam 3, whereas the other ground wheel canbe locked in two positions, for example, in the position in which itsaxis of rotation is parallel to the beam 3 and in a position in whichthis axis encloses an angle with the beam. The implement can be moved inthe working position wherein the frame beam 3 is arranged transverse tothe direction of movement. In the transport position, the castor groundwheel of the foremost rake member is unlocked so that it operates as acastor wheel, whereas the ground wheel of the hindmost rake member canbe adjusted into a new position in which it is essential parallel to thedrawbar 7 and serves also in this case as a directional ground wheel. Inthe position in which the rake members spread the crop, the swath boardscan be fixed in the position indicated by broken lines in FIG. 1 inorder to prevent the crop from being displaced too far. In this positionthe distance between the outermost points of the swath boards 9 ispreferably almost as large as the distance C. When the swath boardsoccupy the position indicated by solid lines, the implement can form aswath. In the transport position, the swath boards 9 are tilted upwardlyand inwardly to an extent such that they are supported on the frame beam3 and in which the boards are substantially parallel to this beam. Thiswill be described more fully hereinafter with reference to FIGS. 14 and15. The construction of the rake members itself will be described morefully with reference to FIGS. 3 to 5.

In this embodiment of FIGS. 3 to 5 parts corresponding with those ofFIGS. 1 and 2 are designated by the same reference numerals.

The rake member 1 comprises a hub 11, which is freely rotatable on ashaft 12. The hub 11 has fastened to it a toothed rim 13 and adownwardly orientated ring 14, which is fastened on the top side to aring 15, extending transversely of the shaft 12 and provided with a ring16 transverse to the axis of rotation of the rake member on the lowerside. The ring 16 is provided with eight arms 17, to the ends of whichrods 18 are pivoted. The rods 18 are pivoted at their other ends to ears19, which are secured by means of bolts 20 to an extension 21 of a groupof tines 10. The group of tines comprises two tines having each ahelical portion 22, the ends of which form the extension 21. The tines11) are freely turnable by their helical portions around one end 23 ofan arm 24 and are held in place by means of a safety ring 25. The arms24 are, in turn, fastened to a ring 26 which is enclosed between ringsand 16 and which is freely rotatable around the ring 14. The tines 10have bent-over portions 27 at their ends, which portions are bentrearwardly viewed in the direction of rotation A of the rake member,while in plan they are at an angle E of not more than in this case about15, to the remaining part of the outwardly projecting tine portion andin this embodiment to a radial line. The downwardly directed portions 23of the arms are at an angle F of not more than 35, preferably about 20,to the center line 28 of the rake member. The tines 10 extend in thisembodiment substantially at right angles to the portion 23 of the arms24, while in operation the center line 28 of the rake member is at anangle of not less than 65, preferably an angle of about 75, to theground. The central shaft of the rake member is held in a bearing 29 ofthe gear box 4, which is rigidly secured to the frame beam 3. Thetoothed rim 12 is in mesh with a gear wheel 30 on the aforementionedshaft 31 which is journalled in the frame beam 3. The gear box comprisesa second gear wheel 32, to which an input shaft 33 is secured. The shaft33 can be coupled with the auxiliary shaft 5 (See FIG. 1). One of thearms 24 is provided with a stop 34, which is adapted to cooperate with acam 36, adapted to rotate about a shaft 35 and arranged on one of thearms 17. The cam 36 is drawn by a spring 37 against a stop 38.

The implement operates as follows; when the implement is in thetransport position, the tines 10 are tilted inwardly into the positionindicated in FIG. 5 by broken lines. In this position (shown in FIG. 2)the rake members have a reduced diameter so that the device has a smallworking width. The implement can be moved into the working position,shown in FIG. 1, by turning the drawbar 7 with respect to the frame beam3 so that the drawbar 7 is substantially perpendicular to the frame beam3 and by adjusting the ground wheels supporting the rake members. Whenthe implement is driven by means of the power take-off shaft of thetractor 6, a torque is exerted on the toothed rim 13 and hence on thehub 11, as a result of which the ring 14 starts to turn in the directionindicated in FIG. 3 by the arrow A, which corresponds with the directionof rotation of the rake member in operation. Since the ring 26 with thearms 24 is freely turnable about the ring 14, the ring 14 turns relativeto the arms 26 and hence the arms 17 turn relative to the arms 24 sothat, with the aid of the coupling rods 18, the ear l9 and theprolongations 21 of the tines 10, the tines themselves are turned aboutthe prolongations 23 of the arms 24. This displacement continues untilthe cam 36 comes into contact with the stop 34, the tines being then inthe position shown in FIG. 3 by solid lines. In this position the arms17 and 24 are rotating in synchronism so that the tines remain in theoutward position and the rake member is operative. When the toothed rim13 is no longer driven, the freely rotatable portion of the arms 24continues rotating in contrast to the portion of the arms 17, which isno longer driven, since the arms 24 with the projecting tines 10 have aconsiderably larger mass than the arms 17 with the coupling rods 18, dueto which the tines au- 5 tomatically return into their transportposition. In the position shown in FIGS. 1 and 3, the tines occupy thesetting preferably used for spreading the crop. As an alternative, thetines may be turned simulatenously into a different working position,which is shown in FIG. 5. This may be achieved by turning the cam 36about the shaft 35 so that the spring 37 holds this cam in asubstantially tangential position and the cam bears on a stop 38 (seeFIG. 5). In this case the turn of the arms 17 relative to the arms 24 issmaller than in the case described above; as a result the tines areturned through a smaller angle and the tines do not extend almostradially. This position of the tines may be particularly useful when theimplement co-operates with the swath boards 9 of FIG. 1, arranged in theposition shown in FIG. 1 with full lines, in order to form swaths.

It will be obvious that the cam 36 adapted to occupy two positions maybe replaced by a cam of different shape. It is possible, for example,to'use an element adapted to turn about a shaft 35 of an arm 17 andhaving three or more cams at different distances from said shaft. Byturning thiselement about the shaft so that each tine a different cam ismoved forwardly, the tines can be moved into different positions. Thismay be important if the machine has to work under completely differentconditions. Light-weight. crop may require a tine position differingfrom that suitable for heavy crop. Moreover, the displacement of thetines involves a different spreading effect, which may be importantunder other climatic conditions. If the machine has to operate in heavywind, a different position of the tines, for example, a less radialposition may be significant. The implement embodying the invention hasvarious advan' tages. In the first place it is possible to move thetines rapidly from a working position into a transport position; in thesecond place the tines can be simultaneously moved from one workingposition into another working position; and in the third place, when themachine is towed, while the rake members are not rotating, the tines areprevented from penetrating into the ground by their tips, in which casethe tines as well as the turf might be damaged.

In the embodiment described above, each group of tines comprising itsown coupling rod 18, which is connected with the arm 17. It will appearfrom FIG. 6 that it is also possible to couple several tines with eachother by means of a coupling rod 40, while only one or two arms 17 arecoupled to the ears 19. The coupling rods 40 are preferably telescopicrods since, during the pivotal movement, the distance between the ears19 slightly varies. Each telescopic rod comprises two halves 40A and408, the former being adapted to move in the longitudinal directioninside the latter, while it can be held in place by means of a spring(not shown).

In the embodiment shown in FIGS. 3, and 5, only one An advantage of theconstruction shown in FIGS. 3 to 5, is furthermore, that the settingmembers I7, 18 and 19 are located beneath the arms 24 so that they arenot likely to come into contact with the crop. As an alternative, saidsetting members may be arranged above the arms 24, as will be apparentfrom FIGS. 7 and 8, which will be described hereinafter.

In the embodiment shown in FIGS. 7 and 8 parts corresponding with thoseof FIGS. 1 to 6 are designated by the same reference numerals. Thedevice shown in said Figures comprises a hub 11, which is freelyrotatable on a shaft 12 and which is provided on top with a toothed rim13 that is in mesh with the gear wheel 32, which can be rotated via theinput shaft 33 coupled with the auxiliary shaft 5. The hub 11 isprovided with a ring 50 transverse to the shaft 12 and rigidly securedto the hub and having a plate 51 fastened to it, which is provided witharms 17, which corresponds with the arms 17 of the foregoing Figures.The arms 17 are linked by the coupling rods 18 to the ears 19A which arefastened to shafts 52 adapted to pivot in sleeves 53 of the arms 24. Bymeans of a clamping bracket 54, the shafts 52 are provided with twotines having helical portions 25. The fastening by means of the bracket54 is such that the helical portions cannot turn freely about the shafts52; they are, however, capable of deflecting resiliently. The arms 24are secured to a ring 55, which is freely rotatable around a downwardlyorientated ring 56 and is held by a ring 57 extending transversely ofthe shaft 12 and secured to the ring 56. The rings 56 and 57 are rigidlysecured to the plate 51. One of the arms 24 is provided with a cam 58,which extends substantially tangentially and is secured to the arm 24 bymeans of a locking pin 59 passed through the opening. The cam 58 has asecond opening 60. During a turn of the rake member, the cam 58 is incontact with the cam 61 on one of the arms 17. By displacing the cam 58the angular displacement of the arms 17 can be varied in the mannerdescribed above. It is then necessary to withdraw a pin 59 from theopening and to displace the cam 58 so that it can again be fastened bymeans of the locking pin 59 and the opening 60 to an arm 24. The plate51 of this embodiment is secured to the ring by means of two bolts 62extending through a slot 63 in the plate 51. The plate 51 is arrangedeccentrically to the center line 28. Also in this embodiment the ends 27of the tines are bent over rearwardly in the direction of rotationindicated by the arrow A through an angle substantially correspondingwith that of the foregoing Figures.

The device operates as follows: As with the device shown in theforegoing FIGS. 1 to 6, the tines 10 are approximately tangential in thetransport position so that the rake member has the smallestcircumference possible. When the rake member is driven via the gearwheel 32 and the toothed rim 13, the arms 17 are turned by the startingtorque with respect to the arms 24 and the coupling rods 18 and the ears19A located, in plan, above the arms 24 will pivot so that the shaft 52in the sleeve 53 is pivoted and the tines are moved into the positionshown in FIG. 7, while the arms 24 are rotated. When the rotation of theplate 50 is arrested, the arms 24 will continue rotating due to theirinertia forces and the tines will be pivoted back into their transportposition. The cam 58 can be displaced by arranging it on an arm 24 bymeans of the second opening 60, so that the arms 17 can turn through asmaller angle relative to the arms 24, the tines being then in aposition as shown in FIG. 5. This may be important, as stated above,with respect to the various processes to which the crop has to besubjected. Moreover, it may be desirable for the rake tines to changetheir positions during one revolution so that the crop is readilydisengaged from the tines. When, in operation, the implement is moved inthe direction of the arrow F and the tines occupy their lowermostpositions as shown on the lefthand side of FIG. 8, the tines have towithdraw from the crop subsequent to their lowermost positions and itmay therefore be desirable to vary the tine positions. In known rakemembers this change of tine positions is accomplished by means of afairly complicated cam structure, but the construction embodying theinvention permits of performing the same in a simpler manner. The plate51 is arranged, as stated above, eccentrically to the center line 28 ofthe shaft 12 so that when the plate turns with respect to the centerline 28 the distance of the pivotal points of the coupling rods 18 withthe arms 17 from the center line 28 is varied, as a result of which, inoperation, the tines l0 perform a pivotal movement during eachrevolution, the crop being thus disengaged from the tines. The areawhere the crop is removed from the tines may be varied by slightlyturning the plate 51 with respect to the ring 50 after the nuts 62 inthe slots 63 are loosened. It is thus possible to disengage the cropfrom the rake tines in a simple and effective manner, which isparticularly desirable when the implement comprises only one rake memberand is employed for the formation of swaths. Such a device is shown inFIG. 9.

The implement is shown schematically; it comprises a rake member of thekind shown in FIGS. 7 and 8, which is arranged on a frame 65,.which iscoupled in known manner with the three-point lifting device or hitch ofa tractor. The implement is supported from two ground wheels 66. Theimplement is, moreover, provided with a swath board 67, which is adaptedto turn about a horizontal shaft 68, extending in the direction ofmovement B for moving the swath board into a position in which it is outof use on top of the implement. The tines 10 of the rake member aremoved into the transport position in the manner described above, forexample, with reference to FIGS. 7 and 8. Moreover, during the rotationabout their axes, the tines change their positions during eachrevolution so that they can shake off the crop and do not carry it alongso that a well-shaped swath is formed.

In the embodiment described in the foregoing, the return of the tinesfrom the working position into the transport position is brought aboutby the inertia forces, as a result of which a movement between those twoelements of the rake member is performed with controls the tinespositions. In order to avoid the risk of nondisplacement of the tines,if the inertia forces were not sufficient under given conditions, it maybe desirable to provide, as is shown in FIG. 10, a spring 69, whichtends to return the arms 17 into their initial positions. Theconstruction shown in this Figure corresponds with the structure shownin FIGS. 3 and 4 and corresponding parts are denoted by the samereference numerals. The spring 69 of this embodiment is a compressionspring which surrounds a rod 69A that is pivotally connected to the ring15 and slides in a bushing 698 which is pivotally connected to the arm24. The spring is fully compressed when the rod 69A extends radially andis extended both in the working position as well as in the transportposition of the tines 10. It should be noted that the spring shown inFIG. may also be employed in the other embodiments.

All the embodiments described above comprise rake tines arranged ingroups. As a matter of course, the tines may, as an alternative, bearranged individually on the arms 24. It should furthermore be notedthat, in the above embodiments, each rake member comprises arms 24holding the tines. Obviously the rake member may be provided in knownmanner with a felly connected in some way or other with the hub of therake wheel, while the tines of the rake member are arranged in saidfelly.

It should furthermore be noted that, in the embodiments described in theforegoing, the tines 10 are adapted to pivot about shafts 23 and 52respectively, extending transversely of the arms 24 and directed towardsthe ground. As an alternative, the shaft need not be directed to theground, but can extend at least substantially parallel to the groundsurface so that the tines are turned upwardly to attain the transportposition instead of being pivoted laterally. Also in this case acoupling rod may be fastened to an extension of a tine as describedabove for the embodiments for the lateral turn of the tines. As analternative, the tines do not turn about a shaft transverse of the arms;they shift from the transport position into the working position. Thisconstruction is shown schematically in FIGS. 11 and 12.

In this embodiment the rake member comprises a plurality of shafts 70,only one of which is shown. As described above, these shafts arefastened to a ring (not shown in FIG. 12) freely arranged in the rakemember and corresponding with the ring 55. The arm 70 has a portion 71directed towards the ground and having a sleeve 72 arranged on it.

An arm 73 is adapted to slide in the sleeve 72 in the direction of theshaft 28. The arm 73 has a helical groove 74 and the sleeve 72 has a pin75 fitting in said groove.

The arm 70 is surrounded by a sleeve 76, which is adapted to slide toand fro on the arm 70 and which is provided with an extension 77 towhich one end of the arm 73 is fastened so that the arm 73 can turn inan opening of the extension 77. The extension is enclosed between twopins 78. The sleeve 76 has pivoted to it a coupling rod 18, which issecured to an arm 17 of a ring 51.

The rake member comprises tines 78 which are directed towards the groundin the operational position and which are fastened to the arms 73 withthe aid of helically wound portions 79 and bolts 80. The tines 78 are,in their topmost positions, substantially perpendicular to the ground.

The implement operates as follows. In the same manner as described withreference to the foregoing Figures, the arms 17 turn at the start of themachine from the position shown in FIG. 11 by broken lines into theposition indicated by solid lines. Owing to this movement, the sleeve 76is displaced with the aid of the coupling rod 18 into the positionindicated by solid lines by its travel along the arm 70. Thisdisplacement causes formed as a result of the position of the pin in thegroove 74.

At the termination of the drive of the rake member, tha arm 17 is againdisplaced by inertia forces relative to the arm 70 into the positionindicated by broken lines so that the tines 78 also are shifted backinto the position shown in broken lines.

In this structure the diameter of the rake wheel is reduced, whilesimultaneously the tines are moved upwardly.

In the embodiments described above, coupling rods 18 are used. Thisecoupling rods, though being advantageous, are not always necessary. Thedisplacement of the two elements may bring about a displacement of thetines in other ways.

In the embodiment shown in FIG. 13, no coupling rods are provided; thearms 17 are provided with slots in which pins 91 of the ears 19A areadapted to slide. In this embodiment parts corresponding with those ofthe embodiments shown in FIGS. 7 and 8 are designated by correspondingreference numerals. The dimension of the slot 90 is such that the arms17 can turn into the two positions shown so that the tines can turn outof a practically tangential transport position into a practically radialworking position and vice versa.

The swath boards 9 of FIGS. 1 and 2 may be placed in various positionsin a simple manner as is shown in FIGS. 14 qnd 15. In these Figuresparts corresponding with those of FIGS. 1 to 5 are designated by thesame reference numerals. The swath boards 9 are provided with arms 100,which are linked via a fork 101 and a pivotal shaft 102 extendingtransverse to the arm to a sleeve 103 arranged rotatably on the shaft 2of the main implement frame.

The implement comprises furthermore a ring segment 104 having recesses105, 106 and 107, which are open on the top side. The shaft 102 isarranged, viewed from above, within the ring segment 104 and preferablynear the sleeve 103. Thus, the swath boards 9 are arranged as close aspossible to the tines of the raking members without touching the tines,during their movement around the shafts 102. The swath board has atubular guide and a plurality of resilient bars 109 of alternately equallengths.

In operation, the swath boards 9 bear on the ground by the guide 108 andare adapted to move up and down around the shaft 102 with respect to theframe so that they can follow the unevennesses of the soil. In theposition in which the swath boards are used to form swaths (see FIG. 1in full lines), the arms are located in the recesses 106.

In the position in which each swath board 9 is used for preventing thecrop from being displaced too far, for example, at the edge of a field(see FIG. 1,. dotted lines), the arm 100 is located in the recess 105.When the arm 100 is turned out of the recess, the swath board can bedisplaced by turning the sleeve 103.

In the position in which the arm 100 has been turned to an extent suchthat it is located in the recess 107, the swath board 9 is in thetransport position and bears on the beam 3 (see FIG. 2; see also thedisposition of FIG. 15, in which the rear side of the implement with theswath boards in the transport position is shown). The recess 107 islocated in a portion of the ring segment 104 which is higher than thefurther part. The ring seg ment 104 is, with the aid of a bolt 114,connected to the gear box 4 and is provided with a slit 115 throughwhich the bolt 114 extends. The height of the ring segment 104 can bealtered by loosening the bolt 114 and moving the ring in an upward anddownward direction. The construction described above permits of movingthe swath boards in a simple manner into the transport position. Theconstruction has moreover the advantage that is gives many operatingpossibilities and is not expensive.

In FIG. 16 the parts of the detail corresponding with those of FIGS. 3and 4 are designated by the same reference numerals. The arms 24 arearranged on the ring 26, which is adapted to turn about the ring 14. Thering 14 has fastened to it the arms 17. The ring 14 together with thering is arranged on the hub 11, to which the toothed rim 13 is alsosecured. In order to avoid excessive friction during the turn of thering 26, forming one element, around the ring 14, forming the otherelement, four rings 110, 111, 112 and 113 are provided, which provide asatisfactory guide; these rings may be made of bronze or of some otherbearing material, for example, a synthetic resin.

Reference will now be made to FIGS. 17 to of the drawings which show theconstruction and arrangement of one of the rake members 1 in greaterdetail. In this embodiment parts corresponding with FIGS. 1-6 aredesignated by the same reference numerals. The rake member has a hub 11which is freely rotatable about the upwardly extending axis 28 of anupright shaft 12 affording that axis. The hub 1 1 incorporates anupwardly facing toothed rim l3 and an annular element or annulus 14which incorporates a cylindrical portion 15A (FIG. 20) whose centralaxis of curvature is substantially coincident with the axis 28. Thebottom of the cylindrical portion 15A is integrally connected to aflange portion 16 the greater part of which is contained in a plane thatis substantially perpendicular to the axis 28. The upper edge of thecylindrical portion 15A of the annular element or annulus 14 is bentover inwardly so as to extend substantially parallel to the flangeportion 16 and is secured by bolts to a ring 15 and to the overlying hub11. The flange portion 16 has eight outwardly and downwardly projectingarms 17 secured to it which arms are spaced apart from one another atregular 45 intervals around the axis 28. The outer free ends of the arms17 are pivotally connected to the ends of crank rods 18 whose oppositeends are pivotally connected to lugs 19 forming parts of plates that aresecured by bolts 20 to extensions 21 of corresponding tines 10. It willbe seen from FIGS. 17 and 18 of the drawings that the tines 10 are, infact, formed in integral pairs from single lengths of spring steel wireor rod, the two tines of each pair each including a helically wound coil22 and the two coils 22 being integrally interconnected by a loop whichforms part of the corresponding extension 21 and which is thusindirectly secured to the corresponding lug 19 by a pair of the bolts20. Each group of tines 19 is turnable about the axis of an end portion23 of a corresponding spoke 24 by way of its helical coils 22, the tinesbeing prevented from becoming axially detached from the spoke ends 22 bymeans of rings 25 that are fastened to the spoke ends 23 between thecorresponding coils 22 by transverse pins.

There are eight spokes 24 and they are secured to a generally annularelement 27A having a cylindrical portion 28A (FIG. 20) thatsubstantially concentrically surrounds the cylindrical portion 15A ofthe annulus l4 and also a larger upper flange portion 29A and a lowersmaller flange portion 30A, said portions 29A and 30A both be i ngcontained in planes that are substantially perpendicular to the axis 28.The annulus 14 that is linked to the tines 10 by the rods 18 and thegenerally annular element 27A that is linked to the tines 10 by thespokes 24 are turnable relative to one another about the axis 32.Bearing material is arranged between the cylindrical portions 15A and28A of the annulus 14 and the annular element 27A and between the flangeportion 16 of the annulus 14 and the lower smaller flange portion 30A ofthe annular element 27A. The bearing material is conveniently asynthetic resin or other plastics material and, in the embodiment whichis being described, is afforded by a plurality of uniformly spaced capsor buttons 30B that are made for instance of nylon and that are fastenedto the appropriate portions of the generally annular element 27A.

The free end of each tine 10 takes the form of a bentover portion 27which is inclined rearwardly with respect to the direction A relative tothe remainders of the tines. As seen in plan view, angles of not morethat 25 are enclosed between the longitudinal axes of the portions 27and those of the remainders of the tines 10. In the embodiment which isbeing described, the angles which have just been mentioned have valuesof substantially 15. The longitudinal axes of the spoke ends 23 areinclined to the axis of rotation 28 by an angle of not more than and itis preferred that said angle should have a magnitude of substantially20. As can be seen in FIG. 18 of the drawings, the tines 10 are inclinedat angles of substantially 90 to the axes of the spoke ends 23. Theupwardly extending axis of rotation 28 of each rake member 1 is inclinedto the horizontal during the operation of the implement by an anglewhich should not be less than and which it is preferred should have amagnitude of substantially The shafts 12 that afford the axes ofrotation 28 are secured in sleeves 29 of the corresponding gear boxes 4and it will be realised that drive is transmitted from one gear box 4 tothe other by toothed pinions (not shown) that are in mesh with thecorresponding toothed rims 13 and that are fastened to the opposite endsof the aforementioned rotary shaft that extends internally of the framebeam 3. One of the two gear boxes 4 houses a toothed bevel pinion 32that is mounted at the internal end of the aforementioned rotary inputshaft 33 with its teeth in driving mesh with those of the correspondingrim 13. The input shaft 33 has an outwardly projecting splined orotherwise keyed end which can be placed in driven connection with thepower take-off shaft of the tractor 6 or some other operating vehicle byway of the aforementioned telescopic transmission shaft 5 havinguniversal joints at its opposite ends.

The ring 15 is provided with a guide in the form of an arcuate slot 36Awhose center of curvature is coincident with the corresponding axis ofrotation 28. A pin 37A secured to the upper larger flange portion 29A ofthe generally annular element 27A is entered upwardly through the slot36A and affords an extension of said generally annular element 27A. Aportion of the length of the guide slot 36A can be blocked off and thusrendered ineffective by a strip-shaped stop 38A formed at one edge witha substantially semicircular recess 39A arranged to receive the pin 37Awhen said stop 38A is in an effective blocking position. As can be seenbest in FIG. 20 of the drawings, the stop 38A is longitudinallydisplaceable (i.e., in a substantially radial direction with respect tothe axis 28) alongside a support 38B (FIG. 19) fastened to the ring 15between a radially inner ineffective position (shown in full lines inFIG. 20) and a radially outer blocking position (shown in broken linesin FIG. 20). A retaining member 40A is provided to maintain the stop 38Ain either one of the two positions which have just been mentioned, saidlocking member 40A comprising a ball 43A located in the mouth of a bore41A of the corresponding hub 11 under the action of a helicalcompression spring 42A that is contained in the bore 41A and which tendsto urge the ball 43A downwardly out of said bore. The strip-shaped stop38A is formed with two relatively spaced holes or recesses 44A eitherone of which can be placed in register with the larger diameter ball 43Awhich will then be urged downwardly into that hole or recess 441Awhereafter the stop 38A will be retained in the corresponding positionuntil positive manual displacement thereof re-compresses the spring 42Aand allows the stop to be moved to its alternative position.

When the raking implement that has been described is in the transportposition thereof that is illustrated in FIG. 17 of the drawings, thetines 10 of the two rake members 1 are turned inwardly about the spokeends 23 as compared with their working positions. These inwardly tiltedpositions of the tines 10 are also shown by regularly broken lines inFIG. 17 of the drawings. When the implement is to be brought to aworking position, the drawbar 7 is turned about the pivot 8 relative tothe frame of the implement until said draw bar extends approximatelyperpendicular to the frame beam 3 as shown in FIG. 1 of the drawings.The ground wheels (not shown) of the implement which support its rakemembers 1 are also adjusted to bring them to appropriate positions withrespect to the direction B. As soon as rotary drive is applied to theinput shaft 33, a torque is exerted upon the toothed rims 13 and uponthe hubs 11 that are integral with them. The result is that each annulus14 (which is bolted to the corresponding hub 11) tends to be turned inthe direction A (FIG. 17) about the corresponding axis 28 (FIG. 18).Since each annulus 14 is linked to the tines 10 by the cranked rods 18,and since the nylon caps or buttons 30B readily allow each annulus 14and each generally annular element 27A to turn relative to one anotherabout the corresponding axis 28, each annulus 141 and its arms 17 turnrelative to the spokes 24 so that the rods 18 turn each pair of tines 10about the corresponding spoke end 23 in a direction opposite to thedirection A as seen in FIG. 17 of the drawings.

The tines 10 continue to turn about the spoke ends 23 until the pin 37A,which is simultaneously moving along the slot 36A away from the end athereof comes to rest in the recess 39A of the stop 38A which stop will,under these circumstances, occupy the radially outer position thereofthat is shown in broken lines in FIG. 20 of the drawings. Thecircumstances which have just been described are also shown in FIG. 17of the drawings from which it will be seen that, under thesecircumstances, the tines 10 are turned about the spoke ends 23 into thepositions that are shown in full lines in the same Figure. Thesepositions of the tines 10 are generally the most satisfactory foroperations in which hay or other crop is to be tedder or spread atrandom across a field. If, as an alternative, the stop 38A is placed inthe radially inner position thereof that is shown in FIG. 19 of thedrawings and in full lines in FIG. 20 thereof, said stop becomesineffective and the pin 37A can move along the whole of the length ofthe slot 36A from the end a thereof to the position shown in FIG. 19 ofthe drawings. Under these conditions, the tines are turned further aboutthe spoke ends 23 and reach substantially the positions shown inirregularly broken lines in FIG. 17 of the drawings in which, as seen ina direction parallel to the corresponding axis 28, they are disposedsubstantially radially with respect to that axis. This position of thetines is generally to be preferred for operations in which the hay orother crop 5 is to be collected into swaths or windrows. The nylon orother plastics caps or buttons 3 08 that are disposed between thecylindrical portions A and 28A of the annular element or annulus 14 andthe generally annular element 27A and also the caps or buttons 308 thatare disposed between the flange portions 16 and 30A of said elements 14and 27A constitute effective and cheap bearings that readily allowrelative movements of the elements 141 and 27A to take place whilenevertheless providing some resistance to such movements so thatrelative displacement occurs smoothly and so that there is little, ifany, tendency for the tines 10 to move outwardly into undesirablesettings when the implement is arranged in its inoperative transportposition. Since the portions 15A and 16 of the element 14 and theportions 28A and 30A of the element 27A are both substantiallyperpendicularly inclined to one another, there are bearing surfaces thatwill resist forces acting in both substantially horizontal andsubstantially vertical directions.

In FIGS. 21 and 22 of the drawings are parts corresponding with those ofFIGS. 17-20 nominated with corresponding reference numerals. TheseFigures illustrate a modification of the rake members 1 in which twostops 45A are provided on the ring 15 at an angular distance apart fromone another around the corresponding axis of rotation 28 ofsubstantially 90. The guide slot 36A is formed in the ring 15 betweenthe two stops 45A and is arcuately curved around the corresponding axisof rotation 28 and subtends an angle of substantially 50 at that axis.The extension pin 37A is rigidly secured to the upper larger flangeportion 29A of the generally annular element 27A and projects upwardlythrough the slot 36A. An arcuately curved plate 46A is disposed betweenthe two stops 45A and is formed with a slot 47A that overlies the guideslot 36A in the ring 15 but that does not coincide throughout the wholeof its curved length with said slot 36A. A transverse bore is formedadjacent the upper end of the extension pin 37A and a safety pin 48A ofa generally known construction which includes a resilient retaining ringis entered through said bore to hold the plate 46A in place. Uponremoving the safety pin 48A, the plate 46A can be inverted and replacedon top of the ring 15 so that an alternative portion of the underlyingslot 36A is effectively blanked off. As shown in FIG. 22

of the drawings, the plate 46A occupies a position in which theextension pin 37A can move along the slot 36A in a direction opposite tothe direction A away from the guide end a to a position at the extremeopposite end of the slot 36A. The pin 37A is, in fact, shown in FIG. 21as occupying the position just mentioned. The tines 10 are shown in acorresponding angular set

1. A raking implement for the displacement of crop lying on the ground,comprising a frame and at least one rake member rotatably mounted on anupwardly extending shaft supported on said frame, said rake memberhaving radial arms by tines pivotably secured adjacent the outerportions of said arms and said arms being operatively associated withdriving means for rotation, said arms being interconnected with tworotatable and relatively displaceable elements located adjacent saidshaft, said driving means including a first of said elements, the secondelement being linked with the first element through pivot connections tosaid tines, whereby, the torque of rotation displaces said elements withrespect to one another and pivots said tines from one position toanother, stop means on said rake member to limit the relativedisplacement of said elements with respect to one another.
 2. Animplement as claimed in claim 1, wherein said first element is anannular guide with its center of curvature being substantiallycoincident with said shaft.
 3. An implement as claimed in claim 2,wherein said second element is a ring that is connected to said guide.4. An implement as claimed in claim 3, wherein said annular guideincludes a slot which subtends an angle of substantially 50* at the axisof rotation of said rake member and said second element moves along saidslot.
 5. An implement as claimed in claim 4, wherein the relativemovements of said two elements is controlled by limiting means and saidlimiting means is a stop whereby a portion of said guide slot can beblocked.
 6. An implement as claimed in claim 5, wherein said stop isdisplaceable relative to said guide in a substantially radial directionrelative to said shaft.
 7. An implement as claimed in claim 6 whereinsaid second element has an extension and said stop has a recess shapedto receive said extension.
 8. An implement as claimed in claim 7,wherein said stop is displaceable in a direction substantially parallelto its own length and is associated with a retaining mechanism whichfixes said stop in either of two position.
 9. An implement as claimed inclaim 8, wherein said retaining mechanism comprises a spring-loadedmember having an at least partly spherical surface that cooperates witheither one of two holes in said stop.
 10. An implement as claimed inclaim 7, wherein said limiting means comprises a plate that has slotmeans and which can be inverted 180* to vary the effective length ofsaid guide and change the effective position of said guide relative tosaid shaft.
 11. An implement as claimed In claim 10, wherein saidextension normally projects through said slot means in the plate and hasa releasable pin to retain the plate in an appointed position when thepin is in engagement with said extension.
 12. An implement as claimed inclaim 1, wherein said two elements are annular and concentricallymounted with respect to one another, the adjacent portions of saidelements being connected by synthetic resin bearing material.
 13. Animplement as claimed in claim 12, wherein two relatively inclinedportions of a first element are arranged to cooperate with tworelatively inclined adjacent portions of the other element through saidbearing material.
 14. An implement as claimed in claim 13, wherein saidrelatively inclined portions of said elements are inclined to oneanother at substantially 90*.
 15. An implement as claimed in claim 13wherein the bearing material is in the form of buttons.
 16. An implementas claimed in claim 15, wherein said buttons are spaced apart from oneanother at regular intervals.
 17. An implement as claimed in claim 12,wherein one of the relatively inclined portions of each element extendssubstantially parallel to the axis of rotation of said rake member andeach of the other relatively inclined portions extends substantiallyperpendicular to said axis.
 18. An implement as claimed in claim 1,wherein said tines are biased by a spring to return to an initialnonworking position.
 19. A raking implement for the displacement of croplying on the ground, comprising a frame and a plurality ofinterconnected rake members mounted on upwardly extending axis shaftssupported on said frame, at least one swath board being pivotablyconnected by an arm to one of said axis shafts which coincides with thecenter line of its respective rake member, the pivotal connection ofeach swath board including a support with means that limits the lateralmovements of said board, each swath board being pivotable from a workingposition to an inoperative transport position, the pivotal connection ofeach swath board including a support to limit the lateral movements ofsaid boards.
 20. An implement as claimed in claim 19, wherein there aretwo swath boards pivotably connected to said axis shafts.
 21. Animplement as claimed in claim 20, wherein said swath boards arepivotable into two alternative working positions, and one of saidworking positions is located to define the greatest distance betweensaid two swath boards which approximately equals the overall width ofthe implement.
 22. An implement as claimed in claim 20, wherein, in thetransport position, said swath boards are positioned substantiallyparallel to a frame beam interconnecting said rake members.
 23. Animplement as claimed in claim 20, wherein, in the transport position,said swath boards are pivoted to locations above a frame beaminterconnecting said rake members.
 24. An implement as claimed in claim20, wherein said support is circular with recesses in its upper edge andeach rake member is mounted on an arm that is movable to any one of saidrecesses around the axis shaft of the respective rake member.
 25. Animplement as claimed in claim 24, wherein said recesses correspond to atleast one working position and a transport position.
 26. An implement asclaimed in claim 25, wherein each swath board is turnable about asubstantially horizontal axis and movable in upward and downwarddirections, said axis being located closer to the axis shaft of therespective rake wheel than the rim of said support.
 27. An implement asclaimed in claim 26, wherein the connection of each swath board to theaxis shaft of a rake member includes a pivot bushing which is turnablyconnected to the axis shaft of a rake member, a second pivot connectionbeing secured in said bushing.
 28. An implement as claimed in claim 27,wherein each swath board has a lower guide beam which bears against theground during operation.
 29. An implement as cLaimed in claim 28,wherein part of the swath board which is foremost viewed in thedirection of travel is situated near the circular path traced byrotating of the tines of said rake members in their outermost positions.30. An implement as claimed in claim 25, wherein said support isvertically adjustable along its axis shaft.
 31. An implement as claimedin claim 19, wherein each rake member includes a partly circular part onits axis shaft and said part has downwardly extending arms which arecoupled to supports for tines.
 32. An implement as claimed in claim 19,wherein said swath board has spring tines of varying lengths extendingsubstantially parallel to one another and a frame beam interconnects theaxis shafts of the raking members and in the transport position thetines of said swath board extend substantially parallel to said framebeam.
 33. A raking implement for the displacement of crop lying on theground, comprising a frame and at least one rake member rotatablymounted on said frame and supported on an upwardly extending axis,driving means connected to said rake member, and tines being turnablysupported on said member, said tines being drivenly coupled to anelement on which the driving torque is exerted, said element, with thetines, being displaceable with respect to the remainder of said rakemember, and said element being mounted on said rake member to displaceindependently of the rotation of said rake member in response to thetorque exerted by said driving means of the rake member, whereby saidelement and tines are displaced and moved with respect to the remainderof said rake member, said tines being turned from one position intoanother position during rotation.
 34. An implement as claimed in claim33, wherein said tines are moveable from a transport position into aworking position during rotation.
 35. An implement as claimed in claim33, wherein said element is located around the axis of symmetry of therake member and is rotatably mounted on said member to be turnablearound its own axis.
 36. An implement as claimed in claim 33, whereinsaid element is coupled to a tooth-wheel means that forms a part of saiddriving connection.
 37. An implement as claimed in claim 36, whereinsaid tines are coupled with the element by rod means.
 38. An implementas claimed in claim 37, wherein each of said tines are connected to saidelement with a rod of said rod means.
 39. An implement as claimed inclaim 33, wherein said rake member includes stop means for limiting therelative movement of said element with respect to the remainder of saidraking member.
 40. An implement as claimed in claim 39, wherein theextent of the movement of said element with respect to the remainder ofthe raking member is adjustable with adjusting means associated with thedriving means whereby said tines can be set in different positions. 41.An implement as claimed in claim 40, wherein a stop of said stop meansfor limiting the relative movement of said element is secured to saidrake member.
 42. An implement as claimed in claim 41 wherein said stopis adjustably mounted for setting the tines in different positions. 43.An implement as claimed in claim 33, wherein said element is biased by aspring to return to an initial non-working position.
 44. An implement asclaimed in claim 33, wherein said element is directly connected to saiddriving means for moving the tines from a first position to a secondposition and said driving means is mounted to cause a periodicaldisplacement of said tines during each revolution of said rake member.45. An implement as claimed in claim 44, wherein said element isgenerally circular and eccentrically mounted around the shaft whichaffords the axis of rotation of said rake member, said element beingrotated by said driving means about said axis whereby, during eachrevolution, said tines are displaced from one position.
 46. An implementas claimed in claim 45, wherein said element is adjusTably mounted onsaid shaft to vary the magnitude of effect of rotational torque of saidrake member.
 47. A raking implement for the displacement of crop lyingon the ground, comprising a frame, and at least one rake memberrotatably mounted on said frame, said member being supported on anupwardly extending axis shaft and being connected to driving means forrotation, said rake member comprising radial arms with tines on supportmeans turnable mounted with respect to said shaft, an adjusting memberbeing displaceable relative to the remaining part of the rake member dueto an increase or decrease of torque exerted by said driving means, saidadjusting member being linked with pivotal supports of said supportmeans and said tines to automatically move same from one position toanother position, said adjusting member including fixing means to securesame in different settings relative to the remaining part of the rakingmember to vary the magnitude of movement of the tines from one positionto another.
 48. An implement as claimed in claim 47, wherein saidadjusting member is circular and eccentrically mounted around saidshaft.
 49. An implement as claimed in claim 48, wherein the axis of saidadjusting member is adjustable in a direction parallel to the centerline of said rake member.
 50. An implement as claimed in claim 47,wherein there are two rake members mounted on shafts supported on saidframe.
 51. An implement as claimed in claim 47, wherein said tines arein groups and each arm has a group of tines connected to a support onsaid arm, said support being pivoted to said arm.
 52. An implement asclaimed in claim 47, wherein said tines are biased by a spring to returnto an initial non-working position.